Many in Scotland feel devolution has gone a long way to delivering the separatists' aims, as the devolved Parliament now runs many public services. But the SNP insists the government in Westminster intends to improve services south of the border at the expense of those in Scotland.
Some English regions see the Barnett funding formula as too generous to Scotland. The 25-year-old formula links funding in Scotland to that of England. But the SNP says Scotland pays far too much.
Launching the manifesto on Friday, SNP leader John Swinney said: 'New Labour is cutting Scotland's share of spending on public services. But not fast enough for some. John Prescott has talked about 'blood on the carpet' after the election.'
The SNP claims possible Labour plans to extend public/private partnerships mean£2.5bn worth of improvements could cost as much as£7bn because of the higher cost of borrowing in the private sector.
Mr Swinney added: 'This election will be about who can be trusted to stand up for Scotland. We will be putting the funding of Scotland's services right at the heart of the election campaign.'